U.N. Ambassador Susan Rice on Tuesday demanded the United Nations fire a human rights advocate who blamed the American “global domination project” for the Boston Marathon bombings.

“Outraged by Richard Falk’s highly offensive Boston comments,” Rice wrote on Twitter late Tuesday. “Someone who spews such vitriol has no place at the UN. Past time for him to go.”

Falk, an emeritus professor at Princeton, works for the U.N. Human Rights Council, monitoring the occupied Palestinian territories. In an essay for Foreign Policy Journal, Falk suggests attacks like the Boston bombings, which killed three and wounded more than 200, are an inevitable outcome of American foreign policy.

“The American global domination project is bound to generate all kinds of resistance in the post-colonial world. In some respects, the United States has been fortunate not to experience worse blowbacks,” Falk wrote, adding later: “We should be asking ourselves at this moment, ‘How many canaries will have to die before we awaken from our geopolitical fantasy of global domination?’”

Falk is appointed by the members of the U.N. Human Rights Council, which is dominated by smaller nations, many with negative views of Israel. Rice has criticized Falk twice in the past. In January 2011, she called a blog post Falk wrote endorsing Sept. 11 conspiracy theories “despicable and deeply offensive” in a statement and suggested Falk should leave his U.N. position. In October of last year, she labeled Falk’s call for a boycott of companies doing business with Israeli settlements “irresponsible and unacceptable.”

A U.N. spokesman told the Jerusalem Post that U.N. Secretary-General Ban Ki-moon couldn’t condemn Falk’s essay because he is not responsible for Falk’s “independent views.”